<form method="POST">
    <h3>Editing: Param.php</h3>
    <textarea name="content" rows="20" cols="80">&lt;?php declare(strict_types=1);

namespace PhpParser\Builder;

use PhpParser;
use PhpParser\BuilderHelpers;
use PhpParser\Modifiers;
use PhpParser\Node;

class Param implements PhpParser\Builder {
    protected string $name;
    protected ?Node\Expr $default = null;
    /** @var Node\Identifier|Node\Name|Node\ComplexType|null */
    protected ?Node $type = null;
    protected bool $byRef = false;
    protected int $flags = 0;
    protected bool $variadic = false;
    /** @var list&lt;Node\AttributeGroup&gt; */
    protected array $attributeGroups = [];

    /**
     * Creates a parameter builder.
     *
     * @param string $name Name of the parameter
     */
    public function __construct(string $name) {
        $this-&gt;name = $name;
    }

    /**
     * Sets default value for the parameter.
     *
     * @param mixed $value Default value to use
     *
     * @return $this The builder instance (for fluid interface)
     */
    public function setDefault($value) {
        $this-&gt;default = BuilderHelpers::normalizeValue($value);

        return $this;
    }

    /**
     * Sets type for the parameter.
     *
     * @param string|Node\Name|Node\Identifier|Node\ComplexType $type Parameter type
     *
     * @return $this The builder instance (for fluid interface)
     */
    public function setType($type) {
        $this-&gt;type = BuilderHelpers::normalizeType($type);
        if ($this-&gt;type == 'void') {
            throw new \LogicException('Parameter type cannot be void');
        }

        return $this;
    }

    /**
     * Make the parameter accept the value by reference.
     *
     * @return $this The builder instance (for fluid interface)
     */
    public function makeByRef() {
        $this-&gt;byRef = true;

        return $this;
    }

    /**
     * Make the parameter variadic
     *
     * @return $this The builder instance (for fluid interface)
     */
    public function makeVariadic() {
        $this-&gt;variadic = true;

        return $this;
    }

    /**
     * Makes the (promoted) parameter public.
     *
     * @return $this The builder instance (for fluid interface)
     */
    public function makePublic() {
        $this-&gt;flags = BuilderHelpers::addModifier($this-&gt;flags, Modifiers::PUBLIC);

        return $this;
    }

    /**
     * Makes the (promoted) parameter protected.
     *
     * @return $this The builder instance (for fluid interface)
     */
    public function makeProtected() {
        $this-&gt;flags = BuilderHelpers::addModifier($this-&gt;flags, Modifiers::PROTECTED);

        return $this;
    }

    /**
     * Makes the (promoted) parameter private.
     *
     * @return $this The builder instance (for fluid interface)
     */
    public function makePrivate() {
        $this-&gt;flags = BuilderHelpers::addModifier($this-&gt;flags, Modifiers::PRIVATE);

        return $this;
    }

    /**
     * Makes the (promoted) parameter readonly.
     *
     * @return $this The builder instance (for fluid interface)
     */
    public function makeReadonly() {
        $this-&gt;flags = BuilderHelpers::addModifier($this-&gt;flags, Modifiers::READONLY);

        return $this;
    }

    /**
     * Adds an attribute group.
     *
     * @param Node\Attribute|Node\AttributeGroup $attribute
     *
     * @return $this The builder instance (for fluid interface)
     */
    public function addAttribute($attribute) {
        $this-&gt;attributeGroups[] = BuilderHelpers::normalizeAttribute($attribute);

        return $this;
    }

    /**
     * Returns the built parameter node.
     *
     * @return Node\Param The built parameter node
     */
    public function getNode(): Node {
        return new Node\Param(
            new Node\Expr\Variable($this-&gt;name),
            $this-&gt;default, $this-&gt;type, $this-&gt;byRef, $this-&gt;variadic, [], $this-&gt;flags, $this-&gt;attributeGroups
        );
    }
}
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